Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981spie..280...56l&link_type=abstract
In: Infrared astronomy - Scientific/military thrusts and instrumentation; Proceedings of the Meeting, Washington, DC, April 21,
Astronomy and Astrophysics
Astronomy
6
Background Radiation, Cryogenic Cooling, Focal Plane Devices, Infrared Astronomy, Jfet, Radiation Hardening, Spaceborne Astronomy, Amplifier Design, Capacitance, Circuit Reliability, Feedback Amplifiers, Network Synthesis, Silicon Junctions, Transistor Amplifiers
Scientific paper
Self-heated JFets, applicable for use in low background focal planes cooled to cryogenic temperatures have been developed. The JFets are less sensitive to nuclear radiation than MosFets. JFet circuit design is discussed in terms of the transimpedance amplifier including its input and feedback capacitance. The thermal-mechanical design of the device is outlined, noting that a small heater is required to provide startup after the power has been off for several hours. The electrical performance is discussed in terms of noise and gain levels for an inactive JFet, an active JFet, and a transimpedance amplifier. Future work will concentrate on higher feedback resistance, possibly by means of silicon JFets.
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